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  • Which of the following form of carbon has zero standard enthalpy of formation?Option: 1 GraphiteOption:

Which of the following form of carbon has zero standard enthalpy of formation?

Option: 1

Graphite


Option: 2

Diamond


Option: 3

Fullerene


Option: 4

None of the above


Answers (1)

best_answer

The standard enthalpy of formation for an element in its standard state is ZERO because elements in their standard form are not formed, they are naturally in that state. \Delta H^{o}\, _{f} for C  (s, graphite) is zero, but the \Delta H^{o}\, _{f} for C (s, diamond) is 2000 J/mol, because graphite is the standard state for carbon, whereas diamond is not.

Hence, option number (1) is correct

Posted by

Devendra Khairwa

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